rework bash scripts to be completely, or mostly POSIX-compliant

.bash_profile

@@ -31,8 +31,7 @@ export PATH="$PATH:$VCPKG_ROOT"
 # if executing interactively
 # execute .bashrc in the current login context
 case $- in
-*i*) ;;
-*) return ;;
+*i*) return ;;
 esac
 [ -z "${PS1-}" ] && return
 [ -f "$HOME/.bashrc" ] && . "$HOME/.bashrc"

.bashrc

@@ -6,8 +6,7 @@
 #
 
 case $- in
-*i*) ;;
-*) return ;;
+*i*) return ;;
 esac
 [ -z "${PS1-}" ] && return
 
@@ -51,16 +50,16 @@ __regenprompt() {
 	local git=$(__lazy_git_ps1)
 
 	if [ $err -ne 0 ]; then
-		err="\[\033[$((COLUMNS - 4))G\033[01;31m\]${err}\[\033[0G\]"
+		err="\033[s\033[$((COLUMNS - 4))G${err}\033[u"
 	else unset err; fi
 
-	PS1="$err"                      # error code
-	PS1="$PS1\[\033[?25h\]"         # show cursor
-	PS1="$PS1\[\033[01;35m\]\u@\h"  # user@host
-	PS1="$PS1\[\033[00m\]:"         # separator
-	PS1="$PS1\[\033[01;34m\]\w"     # working directory
-	PS1="$PS1\[\033[01;93m\]${git}" # git branch
-	PS1="$PS1\[\033[00m\]\$ "       # shell sign
+	PS1="\[\033[?25h\]"               # show cursor
+	PS1="$PS1\[\033[01;35m\]\u@\h"    # user@host
+	PS1="$PS1\[\033[00m\]:"           # separator
+	PS1="$PS1\[\033[01;34m\]\w"       # working directory
+	PS1="$PS1\[\033[01;93m\]$git"     # git branch
+	PS1="$PS1\[\033[01;31m\]\[$err\]" # error code
+	PS1="$PS1\[\033[00m\]\$ "         # shell sign
 }
 PROMPT_COMMAND=__regenprompt